Add openrgb-hue: Hue scene gradients for OpenRGB lights

Applies gradients derived from 103 bundled Philips Hue scenes to
OpenRGB-controlled LEDs, with six mapping modes (sequence, per-device,
per-zone, matrix, mirror, shuffle) and five animation modes (static,
scroll, pingpong, pulse, wave). Typer/Rich CLI with dry-run preview,
device/zone targeting, and a scenes-update command to refresh the
bundled dataset from its source gist.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

tests/conftest.py

@@ -0,0 +1,33 @@
+from __future__ import annotations
+
+import pytest
+
+from openrgb_hue.client import LedRef
+from openrgb_hue.color import Color
+from openrgb_hue.scenes import Scene, SceneLight
+from openrgb_hue.targets import synthetic_targets
+
+
+@pytest.fixture
+def sample_scene() -> Scene:
+    """A small hand-built scene with an intentional consecutive duplicate
+    (light 2 and 3 share a color) so dedupe behavior is exercised."""
+    return Scene(
+        name="Test Scene",
+        lights=[
+            SceneLight("light.hue_1", Color(255, 0, 0), 255),
+            SceneLight("light.hue_2", Color(0, 255, 0), 255),
+            SceneLight("light.hue_3", Color(0, 255, 0), 255),
+            SceneLight("light.hue_4", Color(0, 0, 255), 128),
+        ],
+    )
+
+
+@pytest.fixture
+def synthetic_leds() -> list[LedRef]:
+    return synthetic_targets(12)
+
+
+@pytest.fixture
+def matrix_leds() -> list[LedRef]:
+    return [led for led in synthetic_targets() if led.matrix_row is not None]